# std::unique_lock<Mutex>::unlock

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< cpp‎ | thread‎ | unique lock

void unlock(); |  | (since C++11)

Unlocks (i.e., releases ownership of) the associated mutex.

std::system_error is thrown if there is no associated mutex or if the mutex is not locked.

### Parameters

(none)

### Return value

(none)

### Exceptions

If there is no associated mutex or the mutex is not locked, std::system_error with an error code of std::errc::operation_not_permitted.

### Example

| This section is incomplete Reason: no example

### See also

lock | locks (i.e., takes ownership of) the associated mutex (public member function)
release | disassociates the associated mutex without unlocking (i.e., releasing ownership of) it (public member function)

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